Specifies texture unit whose coordinates
should be modified. The number of texture units is implementation dependent,
but must be at least two. Must be one of GL_TEXTURE$i$_ARB where 0 <= $ i
$ < GL_MAX_TEXTURE_UNITS_ARB, which is an implementation-dependent value.

s, t, r, q

Specify s, t, r, and q texture coordinates for target texture
unit. Not all parameters are present in all forms of the command.

Specifies texture unit whose coordinates should be modified.
The number of texture units is implementation dependent, but must be at
least two. Must be one of GL_TEXTURE$i$_ARB, where 0 <= $ i $ < the implementation-dependent
value of GL_MAX_TEXTURE_UNITS_ARB.

v

Specifies a pointer to an array of
one, two, three, or four elements, which in turn specify the s, t, r, and
q texture coordinates.